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है”ह”ह

IS 2002 (2009): Steel plates for pressure vessels forintermediate and high temperature service includingboilers [MTD 4: Wrought Steel Products]

IS 2002:2009

amtil@wTadwr?

($fjfr3@9-)

Indian Standard

STEEL PLATE FOR PRESSURE VESSEL FORINTERMEDIATE AND HIGH TEMPERATURE SERVICE

INCLUDING BOILERS

( Third Revision

ICS 77. 140.30; 77.140.50

@ BIS 2009

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

March 2009 Pried Group 4

Wrought Steel Products Sectional Committee, MTD 4

FOREWORD

This Indian Standard (Third Revision) was adopted by the Bureau of Indian Standards, after the”draft finalizedby the Wrought Steel Products Sectional Committee had been approved by the Metallurgical Engineering DivisionCouncil.

This standard was first published in 1962 and subsequently revised in 1982 and 1992. While reviewing thisstandard, in the light of experience gained during these years, the Committee decided to revise it to bring.in linewith the present practices being followed by the Indian industry and ovmeas statidards of hot rolled steel plates

for pressure vessels including boilers. .

In this revision the ,following changes have &en made ~ ~

a)

b)

c)

d)

e)

f)

Clauses on scope, terminology, manufacture, heat treatment, tolerances, tensil,e test and re-tests have. been modified;

Definitions of Normalizing and Normalizing Rolling have been added;

Amendment Nos. 1, 2, 3 and 4 have been incorporated;

A new clause on references has been incorporated;

Requirements of tolerances on dimensions and shape has been added and adopted 1S0 7452:2002‘Hot-rolled structural steel plates — Tolerances on dimensions and shape’; and

Figure for position of test strips in rolled plates has been deleted.

For the tests specified in this standard (chemical/ physical/ others), the method as specified in the relevant 1S0Standard may also be followed as an alternate method.

The composition of the Committee responsible for formulation of this standard is given in Annex A.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2:1960‘Rules for rounding off numerical values (revised)’. The number of significant places retained in the rounded offvalue should be the same as “that of the specified value in this standard.

AMENDMENT NO. 1 NOVEMBER 2012 TO

IS 2002 : 2009 STEEL PLATE FOR PRESSURE VESSELFOR INTERMEDIATE AND HIGH TEMPERATURE

SERVICE INCLUDING BOILERS

(Third Revision)

(Page 3, clause 9.3) — Substitute the following for the existing clause:

‘9.3 Rolling Mass

Permissible upper deviation from the theoretical mass shall comply to Table 2.Whereas, the permissible lower deviation shall be calculated based on thenegative tolerance on the thickness as per 9.1.’

(MTD 4)Reprography Unit, BIS, New Delhi, India

IS 2002:2009

Indimz Standard

STEEL PLATE FOR PRESSURE VESSEL FORINTERMEDIATE AND HIGH TEMPERATURE SERVICE

INCLUDING BOILERS

( Third Revision)

1 SCOPE

This standard covers the requirements of plain carbonsteel plates produced in discrete cut lengths of flatproduct or plates that have been leveled and flatlencd

and cut to length from a coiled product. These platesare intended for use in pressure vessels for intermediateand high temperature service which include boilers.

Plates under this standard are available in three gradesas follows:

a)

b)

c)

Grade I — Low tensile steel plates for fireboxes and boiler plates which require welding,flanging or flame cutting;

Grade 2 — Medium tensile plates which canbe used for welding, flanging and flamecutting; and

Grade 3 — High tensile steel plates whichcan be used for welding, flame cutting, andhot flanging under controlled conditions.

~ REFERENCES

The following standards contain provisions whichthrough reference in this text, constitute provisions ofthis stanciard. At the time of publication, the editionsindicated were valid. All standards are subject torevision and parties to agreements based on thisstandard are encouraged to investigate the possibilityof applying the most recent editions of the standardsindicated below:

IS No.~z~ (relevant

parts)1599:1985

1608:2005

1956 (Part 4):1975

4225:2004

4748:1988

TitleMethods of chemical analysis of steel

Method for bend test (secondrevision)

Metallic materials — Tensile [.estingat ambient temperature (thirdrevision)

Glossary of terms relating to iron andsteel: Part 4 Steel sheet and stripRecommended practice for stmightbeam ultrasonic testing of steel plates(second revision)

Methods for estimating average grainsize of metals (@t revision)

IS No. 71tle

8910:1978 General technical delivery require-ments for steel and steel products

12457:1988 Code of practice for evaluation,repairs and acceptance limits of

surface defects in steel plates andwide flats

EVISO 7452: Hot-rolled structural steel plates —

2002 Tolerances on dimensions and shape

3 TERMINOLOGY

For the purpose of this standard, the followingdefinitions in addition to those given in IS 1956 (Part 4)shall apply.

3.1 Plate as Rolled — This term refers to the unit plate(5 mm thick and above) as rolled from the slab ordirectly from an ingot, in its relation to the locationand number of specimens, and not to its condition.Plates produced from coil means the plates which have

been levelled or flattened and cut to length.

3.2 Normalizing — It is a heat treating process inwhich a steel plate is reheated to a uniform temperatureabove the upper critical temperature and then cooledin air to below the transformation range.

3.3 Normalizing Rolling — A hot rolling process inwhich the final rolling passes are carried out at asuitable higher temperature, followed by cooling innatural air to a temperature below the transformation

temperature, in order to produce a structure, analogousto that obtained by a separate normalizing treatmentof hot rolIed product.

4 GENERAL REQUIREMENTS

General requirements relating to the supply of steelplates for pressure vessels shall conform to IS 8910.

5 MANUFACTURE

5.1 Steel shall be manufactured by any process of steelmaking except Bessemer process. It may be followedby secondary refining or secondary vacuum treatment.

5.1.1 The steel shall be fully killed and made to coarsegrain practice.

I

IS 2002:2009

5.1.2 The material shall have acarburized austeniticgrain size number in the range 1 to 5 as determined bythe carburizing method specified in IS 4748. However,the above grain size requirement shall he deemed asfulfilled if, on ladle analysis, the total aluminiumcontent is not more than 0.020 percent.

5.1.3 The plates are produced in either discrete cutlengths of flat product or from coils.

6 CHEMICAL COMPOSITION

6.1 The ladle analysis of the material, when carriedout either by the method specified in the relevant partsof IS 228 or any other established instrumental/chemical method shall be as given in Table 1. In caseof dispute the procedure given in IS 228 and its relevantparts shall be the referee method.

6.2 Permissible variation in case of product analysisfrom the limits specified in 6.1 shall ix as follows:

Constituent Variation Over the Specified

Maximum or Under the Minimum

Limits Percent

(1) (2)

Carbon 0.03Silicon 0.03Sulphur 0.005Phosphorus 0.005Manganese 0.05

NOTE — Variation shall be applicable both over and under

the specified limits in several determinations in a heat.

7 HEAT TREATMENT

7.1 Unless specified otherwise, plates shall be supplied

in normalized condition/controlled rolled condition.

7,2 Subject to agreement between the purchaser and

the manufacturer, normalizing may be replaced with

normalizing rolling process.

7.3 Plate in coiled form rolled under controlled rolling

condition in a hot strip mill and straightened byievelling as plates up to ~2 mm thickness are considered

self normalized and accepted as-rolled condition.

8 FREEDOM FROM DEFECTS

8.1 The plates shall be rolled to the dimensionsspecified. The material shall be free from harmfuldefects. Scale pits am! other minor surface defects may

be removed by grinding. The depth of grinding beingsuch that the thickness of the plate shall not go belowthe specified value at the spot where the dressing is

done. The grinding shall be even and smooth and shall

be widened enough to remove sharp ridges. Dressingwith a hammer or welding of defective spots shall not

be permitted.

8.2 Edge imperfection may be rectified subject tomutual agreement between the purchaser and themanufacturer.

8.2.1 Laminar type discontinuities, 25 mm and less inlength and visible to the unaided eye on the edges ofplate, as prepared for shipment by the manufacturer

are acceptable and do not require exploration.

Table 1 Chemical Composition

(Clause 6.1 )

SI Grade Carbon Manganese Silicon Sulphur Phosphorus

No. Percent Percent Percent Percent PercentMax Max Max Max

(1) (2) (3) (4) (5) (6) (7)

i) 1 0.18 0,50-1.20 0.15-0.35 0.040 0.035

ii) 2 0.20 0.50-1.20 0.15-0.35 0.040 0.035

iii) 3 0.22 0,50-1.20 0. I5-0.35 0.040 0.035

NOTES

1 Carbon content over the maximum specified shall be increased by:

a) For plates over 25 mm up to and including 65 mm thick — 0.02 percent Max; and

b) For plates over 65 mm thick — 0.04 percent Max.

2 Total aluminium content shall not exceed 0.020 percent for all thicknesses.

3 Nitrogen content, shall not exceed 0.012 percent. This should be ensured by the manufacturer by occasional check analysis.

4 Residual copper shall not exceed 0.10 percent.

5 Whenever any alloying elements are added for achieving strength, maximum carbon equivalent shall not exceed 0.44 for steelsused f>r welding.

Carboh equivalent (CE) based on ladle analysis:

C + Mn Cr+Mo+V Ni+CuCE=—

6+5+ 15

2

‘1

8.2.2 All larger discontintrities shall be explored todetermine their depth and extent. Discontinuities shallbe considered continuous when located in the sameplate within 5 percent of the plate thickness andseparated by a distance less than the length of thesmaller of two adjacent discontinuities.

8.2.3 Repair by Welding

Repair welding shall be permitted only with the

approval of the purchaser. Preparation for repairwelding shall include inspection to assure completeremoval of the defect. Repair if permitted shall be doneas per IS 12457.

9 DIMENSIONS AND TOLERANCES,

9.1 Unless otherwise agreed the dimensional tolerancesfor hot-rolled steel sheet shall be as given inIS/fSO 7452.

9.2 Unless otherwise agreed the restricted thicknesstolerances shall be as given in 1S/1S0 7452.

9.3 Rolling Mass

Permissible deviation from the theoretical mass shallcomply to Table 2.

10 CALCULATION OF MASS

The mass of plate shall be calculated on the basis thatsteel weighs 7.85 g/cm~.

11 SELECTION OF TEST SAMPLES

11.1 For plates produced from plate mill, one test

IS 2002:2009

sample shall be taken from corner of each plate as-rolled in transverse to the rolling direction.

11.2 For plates produced from coils one sample fromeach coil should be drawn. All the plates produced fromthe coil are acceptable if the sample meets therequirements of the specification. The size of thesample should be such that a retest specimen, ifnecessary, may be prepared from it,

12 TENSILE TEST

12.1 Test sample shall be selected as per 11.

12.2 The tensile strength, yield stress and percentageelongation, when determined in accordance with1S 1608, shall conform to the requirements specifiedin Table 3.

12.2.1 The rolled surfaces shall be retained on the two

opposite faces of the test piece where practicable. Ifthe test specimen has to be reduced in thickness fortesting purposes, at least one surface should be as

rolled. For plates over 20 mm in thickness, round

specimens are permitted, where the axis of thespecimen shall be located, as nearly as possible,midway between the centre of the thickness and top orbottom surface of the plate.

12.2.2 Should the test piece break outside the middlehalf of the gauge length and the percentage elongationis less than that specified, the test may be discarded at

the option of the supplier and another test made from

the same test sample.

12.3 Subject to mutual agreement between the

Table 2 Permissible Upper Deviation from the Theoretical Mass(The Values Shown in the Table Apply to Consignments Weighing 25 tonne,

Up to but not Including 75 tonne)

(Clause 9.3)

Nominal Permissible Upper Permissible Upper Deviation from the Theoretical Weight in Percentage forThickness Deviation Nominal Width

mm from the Nominal mmThickness

From Up to but mm From 600 From 2000 From2500 From3000 Fromnot up to but Up to but UP to but Up to but 3500

Including not Including not Including oot Including not Including up to2000 2500 3000 3500 4000

(1) (2) (3) (4) (5) (6) (7) (8)

5 8 1.1 7 7.5 8.5 9 —

8 15 1.2 6 6 6.5 7 7.5

15 25 I .3 45 4.5 5 5 5.5

25 40 1.4 3.5 3.5 4 4 4

40 80 1.8 3.5 3.5 4 4 4

80 150 2.2 3.5 3.5 3.5 3.5 3.5including

Over I 50 To be agreed between the supplier and tbe purchaser

3

IS 2002:2009

Table 3 Mechanical Properties

(Clause 12.2)

Grade Tensile Strength Yield Stress 0/0 Elongation onThickness MPa MPa, &fin Gange Length

II I60 60 to 100 100 to 350 s 16 >16to >40 to >60 to 100 to z 60 >60 to

40 60 100 350 350

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)

1 360-480 360-480 350-480 235 225 215 200 185 24 23

2 410-530 410-530 400-530 265 255 245 215 200 22 21

3 460-580 450-570 440-570 290 285 280 255 230 21 20

purchaser and the supplier, the supplier shall guarantee

the required yield stress at any higher temperature (E,).

12.3.1 The plate manufacturer should satisfy the boilermaker and his representative that the steel supplied iscapable of meeting the value (Et).

a) By producing adequate record of test resultson the type of steel concerned; and

b) By showing that the steel supplied actually

conforms to the requirements by ladle analysisand by a statement that, the manufacturing

process has remained comparable; or Inabsence of data mentioned in (a) i) by proofstress test at the design temperature stated on

the individual order.

NOTES

1 By special arrangement between the plate manufacturerand the boiler maker and/or his representative, proof stresstest may be required for the individual order.

2 For all steels (Carbon):

a) When the steel maker has collected a sufficient number

of tests for application to a statistical definition of E,,on the grade of steel; E, should be equal to the averagevalue of the test results at temperature ‘r’ less twostandard deviation.

b) When a sufficient number of test results are notavailable E, should be taken as a minimum valueguaranteed by the steel maker which should be checked

at the time of acceptance. For carbon steels the valueof the proof stress given by the ratio EJR2{)(taken from

Table 4) may be taken without verification at the timeof acceptance.

13 BEND TEST

13.1 Test samples shall be selected as per 11.

13.2 The bend test shall be carried out in accordancewith IS 1599.

13.2.1 The test piece shall be about 230 mm long andnot less than 40 mm wide. The test piece, when cold,shall withstand without fracture being bent overthrough 180°’ either by pressure or by slow and steadyblows from a hammer till the internal diameter is not

greater than twice the thickness of the test piece in the

case of Grade 1 and Grade 2 plates and three times thethickness of the test piece in the case of Grade 3 plates.

13.2.2 During the test, the rolled surface shall be onthe tension side.

14 HOMOGENEITY TEST (FOR GRADE 1PLATE FOR FIRE BOXES ONLY)

14.1 The object of this testis to open and render visibleto the eye any internal defect in the steel, like blowholes, inclusions, etc. The test shall be done at the rate

of one test per cast.

14.2 One test piece 230 mm long and not less than40 mm wide, shall be prepared as given under 13.2.1.For plates 20 mm and under in thickness, the test pieceshall be nicked or grooved, about 1.5 mm deep,transversely in three places at 50 mm intervals startingat 50 mm from one end. The first and third groovesshall be on one face and the middle one on the oppositeface. For plates over 20 mm in thickness, the groovesshall be about 3 mm deep. The test piece shall be brokenat each groove by hammering or by pressing.

14.3 The fracture shall be clean and shall not showany seam, lamination, blow holes or inclusions morethan 6 mm in length in the case of plates 20 mm andunder in thickness and not more than 10 mm in lengthin the case of plates over 20 mm in thickness.

14.4 Three typical photographs (Fig. 1, 2 and 3)showing boiler plates of 10 mm thickness indicatingacceptance and unacceptable limits are given belowfor guidance only.

15 ULTRASONIC TESTING (25 MM THICK

AND ABOVE)

15.1 If agreed between the manufacturer and consumer,plates (25 mm thick and above) shall be tested forultrasonic testing in accordance with IS 4225 forinternal soundness.

15.2 Acceptance Standards

15.2.1 Any discontinuity indication causing a total 10SS

4

IS 2002: 2009

FIG. 1 PHOTOGRAPH 0F30mm THICK PLATE sHOWING FRACTURE wITHOUT ANY DEFECT -ACCEPTABLE

FIG. 2 PHOTOGRAPH OF 30 mm THICK PLATE SHOWING FRACTUREWITHPERMISSIBLE

FIG. 3 PHOTOGRAPHOF 40 mm THICK PLATE SHOWINGPRESENCEOF LAMINATION— NOT ACCEPTABLE

5

IS 2002:2009

Table 4 Minimum Values for the Ratio of the Stress at Proof Limit 0.2 Percentat Elevated Temperature (EJ to the Minimum Specified Tensile Strength

at Room Temperature ( R ) of Carbon Steel Boiler Plates

[Clause 12.3.1 (Note 2)]

Temperature, ‘C 250 275 300 325 350 375 400 425(see Note)

EJRIQ 0.40 0,38 0.36 0.34 0.33 0.32 0.31 0.30

NOTE — For temperature lower than 300”C, any test required for acceptance purposes (in default of records of previous tests atthese temperatures) should be made at 300”C in which cme the proof stress should be not less than the value obtained by calculationfrom the specified minimum tensile strength,

of back reflection which cannot be contained within acircle of, the diameter of which is 75 mm or one half

of the plate thickness, whichever is greater isunacceptable.

15.2.2 Acceptable adjacent discontinuity indicationsshall be separated from each other by a distance equalto or larger than the larger of the adjacent discontinuityindications unless the adjacent defects can be containedin a circle of diameter equal to the acceptance standardfor a single defect.

15.3 Supplementary Requirements

Supplementary requirements if any, will be specifiedin the purchase order.

16 OTHER TESTS

Any test other than those specified above, may beagreed upon at the time of inquiry and order.

17 RE-TESTS

If a test does not give the specified results, two additionaltests shall be carried out at random on the same lot.Both re-tests shall conform to the requirements of thisstandard, otherwise, the lot shall be rejected.

18 RUST PROTECTION

If so desired by the purchaser, each plate shall bepainted with one coat of boiled linseed oil or a suitablerust preventive material (as agreed to between the

supplier and the purchaser) after inspection and

acceptance.

19 TOLERANCES ON DIMENSIC)NS AND

SHAPE

Unless otherwise agreed the tolerances on dimensions

and shape shall be as given in 1S/1S0 7452.

20 MARKING

20.1 Every plate shall be legibly marked with the

following:

a) Manufacturer’s name or trade-mark, if any;

b) Cast number or identification mark by whichthe steel can be traced to the cast from which

it was made and Plate number so that

correlation with T.C. is possible; and

c) Direction of final rolling.

20.2 BIS Certification Marking

The material may also be marked with the Standard

Mark.

20,2.1 The use of the Standard Mark is governed by

the provisions of the Bureau of Indian Standards Act,

1986 and the Rules and Regulations made thereunder.

The details of conditions under which the licence for

the use of the Standard Mark may be granted tomanufacturers or producers may be obtained from the

Bureau of Indian Standards

IS 2002:2009

ANNEX A(Foreword)

COMMITTEE COMPOSITION

Wrought Steel Products Sectional Committee, MTD 4

Orgunizaf ion

Tata Steel Ltd. Jamshedpur

Representative(s)

DR D. BHAITACHRJIX (CJsairaran)

SHRI INORANILCHAKRABORTY(Alternate I)

DR A. N. BHAG/ir (A/tema~e11)

AH India Induction Furnace Association, New Delhi

Bharat Heavy Electrical Ltd. Tiruchirapalli

Central Boilers Board, New Delhi

DGS& D, Bhilai Nagar/Delhi

Escorts Knowledge Management Centre, Faridabad

Essar Steels Ltd, Hazira

SHRI R. P. VARSHNEY

SHRI V. RAJASEKHARAN

REPRESENTATIVE

SHRI ALOK NAYAR

DR A, K. DAS

SHRI R. K. BALASUBRAMANIAM(Alternate)

DR R. K. P. SINGH

SHRI JAYANTAKUMARSAHA (Alternate)Institute of Steel Development and Growth, Kolkata

Jindal South West Ltd. Vasind

M. N. Dastur & Co Ltd. Kolkata /Delhi

SHRI M. K. MAHELSHWARI

SHRI SUBHABRATASF.NGUPTA

SHRI V. K. TYAGI(Alternate)

SHRI P. S. BANDHOPADHYAY

SHRI T. BASU (Alternate)Ministry of Defence (DGOFB), Kolkata

Ministry of Defence (DGQA), Ichapur SHRI S. K. KHILNANEY

SHRI P. MEENA(Ahernafe)

Ministry of Railways (RDSO), Lucknow SHRI RADHEYSHAM

SHRI R. K. NAYYAR(Alternate)

SHIU A. C. R. DASSHRi B. D. GHOSH(Alfernate)

Ministry of Steel (Government of India), New Delhi

Powergrid Corporation of India Ltd, Gurgaon

Rashtriya Ispat Nigam Ltd (VSP), Vkhakhapatnam

REPRESENTATIVE

SHRI P. K. S~N

SHRI P. SRINIVAS(Alternate)

SHRI S. BHAITACHARYA

SHRI P. K. DATrA (Alrernafe)SAIL, Bhilai Steel Plant, Bhilai

SAIL, Bokaro Steel Plant, Bokaro DR M. M. S. SODHI

SHRI P. S. REDDY(Alternate)

SAIL, Central Marketing Organization, Kolkata SHRI P. C. JHA

Ssrrrt B. V. S. PANDIT(Alternate)

SHRI A. KANANSAIL, Durgapur Steel Plant, Durgapur

SAIL, IISCO Steel Plant, Burnpur

SAIL, Research & Development Centre for Iron & Steel, Ranchi

SHRI A. K. SINGH

DR RAMENDATTA

DR B. K. JHA (Alternate)

SHRIC. h’ftSTHUSWAMY

SHRI S. MUKHOPADHYAYA(Ahernare)SAIL, Rourkela Steel Plant, Rourkela

Steel Furnace Association of India, New Delhi

Steel Re-rolling Mills Association of India, Mandi Gobindgarh

REPRESENTATIVE

SHRI B. M. BERIWALA

COL SURINDERSINGH (Alternate)

TCE Consulting Engineers, Jamshedpur

Tata Motors Limited, Pune

DR M. D. MAHESHWARI

SHRI B. R. GALGALI

7

FIS 2002:2009

Organization Representative(s)

In personal capacity [403, Udaigiri, Kausharnbi, Disrt Gksziabad SHRI N. MITRA

(u. /?)]BIS Directorate General DR(SHJUMATI)SN~HBHAm.A, Scientist ‘Fand Head(MTD)

[Representing Director General (Ex-oficio)]

Member Secretary

SHRI DM:PAKJAIN

Scientist ‘E’ (Director) (MTD), BIS

Flat Steel Products Subcommittee, MTD 4:3

TCE Consulting Engineers, Jamshedpur DR M. D. MAHESHWAR[(Convener)

Apex Chambers of Commerce, Lrsdhiana SHRI 1? D. SHARMA

Bhushtm Power and Steel Ltd, Hooghly t%R1 P. S. PAU1.

Federation of Engineering Industries of India, hlew Delhi SHRI H. L. BHARrJWAJ

Stnu H. L. BANSAI.(Ahernute)

Indian Oil Corporation Limited. Noida SHIU M. K. JHA

SHRJT. BANDHOPAOHYAY(A/fernate)

[spat Industries Limited, Dolvi SHRI RAMJSJUKSHSIN~H

SHKI RAJ~N~~RAK. V~JtMA (Alfernate)

SAIL, Bhilai Steel Plant, Bbilai

SAIL, Salem Steel Plant, Salem

Tata Blue Scope Steel Ltd, Pune

Tata Steel Ltd, Jamshedpur

The Tln Plate Company of India Ltd, Jamshedpur

Tbyssenkrupp Electrical Steel India Pvt Ltd. Nasik

SHIU A. DASCWPI’A

SHRI K. L. BAi.ASUI~RAMANIAN(Alternate)

SHRI S, S. SISOOIA

SHRI H. K. AROItA (Abernafe)

SHRI RAJ~SH MAHESHWARI

DR N. GoPt;

SHRI M. SHOML(AUernufe)

SHRI T. K. GHOSH

SHRI A. K. GHOSH(Ahernate)

SI~RIJ. SRINJVAS

SHRI KAPU KAPOOR(Aherntsfe)

8

MGIPF—%3DeDtt. ofBISiOS-27-2J3%300Bcoks

Bureau of Indian Standards

1

BIS is a statutory institution established under the Bureau of /ndian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.

Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed

periodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards

should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Dot: No. MTD 4 (4733).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

—

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